580 



we shall have to look for an iiilerprelation of the organ of Wkber, 

 now that it has becoiiie evident that the view of Guyénot can no 

 longer be held. 



The results of these experiments may be summarized as follows: 



1. When the vagus-branches are cut through, the fishes no longer 

 emit air-bubbles, though they respond in a normal way to light- 

 alternations, vibrations and static stimuli, by their swimming and 

 respiratory movements. 



2. DcstruclUm of the o/v/rt» of Webkr results in fishes responding 

 to light-stimuli (swimming, respiration, sometimes also air-bubl)le) 

 but not 01' ri'i-jj fcdiUj to vibrations. 



3. When the N. octavus is cut through, the fishes respond (and 

 that very violently) lo clianges in the light, but not to vibrations, 

 nor (which need scarcely be mentioned) to static disturbances. 



On comparing these results with those obtained formerly by means 

 of pressure-modification, we obtain the following survey. 



[The first sign denotes reaction caused by swimming- or respiratory 

 lovements, the second by the opening of the sphincter.] 



Very curious is the disappearance of reactions to vibrations as 

 opposed to their remaining after pressure-modifications, when the 

 oi-gan of Wi':bei{ has been destroyed and the N VIII has been cut 

 through. 



